Lifting-jack



(No Model.)

A. V. RYDER. Lifting Jask.

No. 230,966. Patented Aug. 10,1880.

-F|G.1. F'IG.2..

Q I o o z ci .c

2 Z Z 5 l v If 5 minssesx I flwe'niarx N-PETEHS PHOTOLITHOGRAPHER,WASHINGTON. D Q

UNITED STATES ATENT OFFICE.

ANDREW V. RYDER, OF GERMANO, OHIO.

LlFTlNG- JACK.

SPECIFICATION forming part of Letters Patent No. 230,966, dated August10, 1880.

Application filed May 31, 1880. (No model.)

.T 0 all whom it may concern Be it known that I, ANDREW V. RYDER, acitizen of the United States, resident at Germano, in the county ofHarrison and State of Ohio, have invented certain new and usefulImprovements in Lifting-Jacks; and I do hereby declare the following tobe a full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same, reference being had to the accompanyingdrawings, and toletters of reference marked thereon, which form a part of thisspecification.

This invention relates to improvements in lifting-jacks; and it consistsin the arrangement of the several parts hereinafter described, andspecifically pointed out in the claim.

In the drawings, Figure 1 is a side elevation, showing the hand-leverraised, and Fig. 2 is a side elevation, showing the handlever drawndown.

a is the base or sill, into which is mortised the two upright posts b1). between which the jack-post 0 slides up and down. The upper ends ofthe posts I) b are held together by two plates, (1, (only one of whichis shown,) placed in opposite sides and riveted or bolted in position.The jack-post c is provided with a foot, 0, having short spurs 0 whichproject over onto the sides of the posts b and hold the lower end ofsaid jack-post steadily in place between the uprights. The jack-post isprovided with a toothed rack, 0 placed on one of its edges next one ofthe posts I). The teeth of the rack are inclined downward, as shown, andare adapted to hold the end of the stirrup or loop f affixed to thehand-lever 0. The hand-lever e is pivoted on a bolt, 6, put through itsend and through the upper end of one of the posts I), as shown. Thestirrup f engages the toothrack 0 and it has its upper or outer endpivoted to the hand-lever c at a point between the bolt 6 and the handle0 By this arrangement it will be seen that when the handle 0 is loweredthe stirrup f slides downward over the ends of the teeth on the rack 0and when the lever e is raised the stirrup engages one of the teeth andthejack-post is raised. By raising the lever 0 till the sides of thestirrup have swung past the pivotal bolt 0, as shown in Fig. 1, thejack-post will be locked in its place.

In my device I have arranged the parts so that the greatest purchase orpower can be exerted by the person using it.

I am aware that lifting-jacks have been made resembling mine in theirgeneral outline; but they have been arranged so that the power of theperson was exerted by pulling down on the lever c, and in such devicesweights which exceeded the weight of the operator could not be raised.WVith my device any weight equal to the lifting-power of the person canbe raised.

'Having thus described my invention, what I claim, and desire to secureby Letters Patcut, is

The improved liftingjack composed of two parallel upright posts heldtogether by suitable means, a jack-post furnished with guidespurs on itslower end, a stirrup-shaped liftin g-loop passed between the paralleluprights and over the toothed rack on the jack-post and having its armspivoted on opposite sides of a hand-lever, and a hand-lever pivoted tothe top of the upright post against which the jack-post bears, thepivotal point of the said stirrup lifting-loop being fixed between thepivotal point of the hand-lever and the outer or swinging end thereof,substantially as and for the purpose set forth.

In testimony that I claim the foregoing I have hereunto set my hand andseal.

ANDREW V. RYDER.

Witnesses:

REV. THos. S. PARK, J. W. RAMSEY.

